Regression testing is most often used in testing maintenance to existing programs.

回归测试最常用在已有测试的测试维护.

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Though regression testing is costly, it is absolutely necessary in test process.

软件回归测试是代价较高的测试方法, 但是在软件测试过程中又是必不可少的.

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To reduce the cost of regression testing, the test case prioritization method is proposed.

为了降低回归测试的测试成本, 提出了测试用例优先排序的方法.

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